simplified install script

use standard plv8 packages
remove vows from package json
more cleanup; use sudo with mkdir
added sudo to some wget calls
alias sudo in travis-ci file
issue #22103: allow billing to load without sales
tci thrash -- copy path export into yml
un-rooted main.js; cleanup install script
fixed syntax error in buildfile
changed nvm detection
removed dropdb error
added instructions for installing nvm as root
shrinkwrapped
updated readme
Merge branch 'master' into 22070-install-script

Conflicts:
	npm-shrinkwrap.json
updated readme instructions
re-shrinkwrapped
issue #22103: item site to default to default site
cleanup
made installs script louder
install 9.1 contrib